Bud, an undeveloped branch.
Calyx, the outermost part of a flower.
Cambium, the active growing layer between the bark and the wood of a tree.
Capillary, Hair-like. A name given to very small spaces through which water flows by the force of capillary attraction.
Carbohydrate, an organic substance made of oxygen, hydrogen and carbon, but containing no nitrogen; cellulose or woody fibre, sugar, starch are examples.
Carbon, a chemical element. Charcoal is nearly pure carbon.
Carbonic acid gas, a gas consisting of carbon and oxygen. It is produced from the lungs of animals, and by the decay or burning of organic matter.
Catch crop, a crop growing during the interval between regular crops.
Cereal, a name given to the grain crops that are used for food.
Chlorophyl, the green matter in plants.